In ∆RST, shown here, is 20° less than . What is the measure of ?

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In ∆<i>RST</i>, shown here, <br><img src='https://www.fatskills.com/images3/itbslevel12grade6/image_004_044.png'/> is 20° less than <br><img src='https://www.fatskills.com/images3/itbslevel12grade6/image_004_045.png'/>.<br><img src='https://www.fatskills.com/images3/itbslevel12grade6/image_004_046.jpg'/> What is the measure of <br><img src='https://www.fatskills.com/images3/itbslevel12grade6/image_004_040.png'/>?